Valve Clearance

VALVE CLEARANCE





1. Measure the valve clearance as follows.
1) Turn the crankshaft clockwise so that the No. 1 piston is at TDC of the compression stroke.
2) Measure the valve clearance at (A) in the figure.
3) Turn the crankshaft 360° clockwise so that the No.4 piston is at TDC of the compression stroke.
4) Measure the valve clearance at (B) in the figure.

Standard (Engine cold)
IN: 0.25-0.31 mm (0.010-0.012 in)
EX: 0.25-0.31 mm (0.010-0.012 in)





2. If the valve clearance exceeds the standard, replace the adjustment shim
3. Turn the crankshaft clockwise so that the cam on the camshaft requiring adjustment shim replacement are positioned straight up.
4. Remove the camshaft cap bolts as necessary.
(A):For EX side No.1, 2, 3 cylinder adjustment shim removal
(B):For IN side No.1, 2, 3 cylinder adjustment shim removal
(C):For EX side No.2, 3, 4 cylinder adjustment shim removal
(D):For IN side No.2, 3, 4 cylinder adjustment shim removal

Note
^ To replace the shim of the EX side No.2 and/or No.3 cylinder, removal the bolts marked either (A) or (C).
^ To replace the shim of the IN side No.2 and/or No.3 cylinder, removal the bolts marked either (B) or (D).





5. Install the SSTs as shown, using the camshaft cap bolt holes.

Tightening torque:
11.3-14.2 N-m (115-145 kgf-cm, 99.9-125 in-lbf)








6. Align the marks on the SSTs (shaft and shaft clamp).
7. Tighten bolts (A) to secure the SST (shaft).





8. Face the SST (body) toward the center of the cylinder head, and mount it on the SST (shaft) at the position of the adjustment shim to be replaced.





9. Face the notch of the tappet so that a fine screwdriver can be inserted.





10. Set the SST on the tappet by its notch.
11. Tighten bolt (B) to secure the SST (body) onto the SST (shaft).

Caution
^ The cylinder head can be damaged by the tip of the SST (body) while pressing down the tappet.

12. Tighten bolt (C) and press down the tappet.





13. Using a fine screwdriver, pry up the adjustment shim through the notch on the tappet. Remove the shim by using a magnet.
14. Select proper adjustment shim.

New adjustment shim
= Removed shim thickness + Measured valve clearance - Standard valve Clearence (0.28 mm (0.011 in))

15. Push the selected shim into the tappet.
16. Loosen bolt (C) to allow the tappet to move up.
17. Loosen bolt (B) and remove the SST (body).
18. Remove the SSTs and tighten the camshaft cap bolts.

Tightening torque: 11.3-14.2 N-m
(115-145 kgf-cm, 99.9-125 in-lbf)

19. Repeat steps 3-18 for all adjustment shims that require replacement.
20. Check the valve clearance.